 if(!document.getElementsByClassName){
            document.getElementsByClassName = function(className, element){
                var children = (element || document).getElementsByTagName('*');
                var elements = new Array();
                for (var i=0; i<children.length; i++){
                    var child = children[i];
                    var classNames = child.className.split(' ');
                    for (var j=0; j<classNames.length; j++){
                        if (classNames[j] == className){
                            elements.push(child);
                            break;
                        }
                    }
                }
                return elements;
            };
        }
        